I did not take up a lot of science courses back when I was in university because I belonged to the College of Arts and Letters, but let me try to sound a bit knowledgeable in the field of geology for a moment.
Yehliu is full of seawater-eroded holes as well as numerous rocks in various shapes due to the rock layer of the nearby seashore containing limestone subject to marine erosion, weathering, and earth movements... Yes, you caught me! I actually just copied that statement up there off the official brochure.
There are actually a lot of rocks in the area - mushroom rocks, candle rocks, honeycombed rocks, ginger rocks, tofu rocks, etc., so I'm pretty sure you're going to see something you'll find interesting.
The main attraction of Yehliu is the Queen's Head. The first picture below is how it originally looked like (picture taken from the brochure), but because of the continuous eroding process, the neck is slowly becoming narrower and narrower (see second picture). There are some people who fear that after a couple more years, the Queen's Head might totally be deformed. Be sure to look at it yourself before that happens.
|How it originally looks like|
|Back of the Queen's Head, how it currently looks like|
How to get there via public transportation:
You actually have a lot of options in getting there. As for us, we got off at the MRT Zhongxiao Fuxing Exit 2 (捷運忠孝復興站，出口2). Nearby is a bus stop with buses heading straight to Yehliu (I think it's bus number 1815, if I'm not mistaken. You should check out the signboard just to make sure.)
More information can be found in their website: http://www.ylgeopark.org.tw